diff --git a/elaborate.cc b/elaborate.cc
index ec436b9b0..8ca2924a7 100644
--- a/elaborate.cc
+++ b/elaborate.cc
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1998-2013 Stephen Williams (steve@icarus.com)
+ * Copyright (c) 1998-2014 Stephen Williams (steve@icarus.com)
  *
  *    This source code is free software; you can redistribute it
  *    and/or modify it in source code form under the terms of the GNU
@@ -1170,6 +1170,10 @@ void PGModule::elaborate_mod_(Design*des, Module*rmod, NetScope*scope) const
 		  perm_string pname = peek_tail_name(mport[0]->path());
 
 		  NetNet*tmp = instance[0]->find_signal(pname);
+
+		    // Handle the error case where there is no internal
+		    // signal connected to the port.
+		  if (!tmp) continue;
 		  ivl_assert(*this, tmp);
 
 		  if (tmp->port_type() == NetNet::PINPUT) {